Insulating appliance.



W. A. BONNELL. INSULATING APPLIANGE.

APPLIOATION FILED MAY s, 1906.

929,543. d Patent-,ed July 27, 1909.

-A d' S14/vento@ WILLIAM ALEXANDER BONNELL, OF BROOKLYN, NEW YORK.

INSULATING APPLIANCE.

Specification of Letters Patent.

Patented July 27, 1909.

Application filed May 3, 1906. Serial No. 314,975.

f ed for use in connection with outlet'boxes,

for the purpose of securely binding a con.- duit or the like to the outlet box to prevent the same from shifting or slipping, and to insure against abrasion ofthe wires caused by vibratiometc.

To this end my invention comprises a twopart member adapted to be locked to the out-let box and having upper and lower jaws adapted to be fastened together and bind the conduit.

The idea of a two part coupling adapted to be locked to the outlet box and provided with upperand lower jaws is not new, and taken alone, forms no part of this invention, and is disclaimed. 4

Referring to the accompanying drawings, Figure l is an end view of .my combination coupling and nipple, looking from the -outside.. through the coupling into the box. Fig. 2- is a plan view of the coupling with the upper jaw removed. Fig. 3 vis a plan view of thc upper jaw, and Fig. 4 is a section on the linee-44; of Fig. 1.

5 is the outlet box.

G is the neck of the coupling'provided with the threads 7 and adapted to be inserted into the outlet box 5 and fastened thereto by the nut 8. The interior and exterior surfaces of the neck of the coupling, it will be observed,

` the coupling is provided by the upperV and lower jaws 13 vand 12, respectively which jaws are preferably semi-cylindrical in cross section and are provided on each side with the projections 11l-14"and 15-15. The projections on the lower jaw 12 are preferably heavier than the projections on Ithe upper j'aw v13 and extend back to the enlarged intermediate section or shoulder 16 of the coupling. The interior of the lowerjaw is preferably provided with longitudinal ridges 17 which are preferably tapered and may be larger in cross section at the mouth of the coupling than at the enlarged intermediate section, and the upper jaw 13 is preferably provided onv the interior with transverse ridges 18 which may be graduated in size, beginning with the smaller ridge at the mouth of the coupling and increasing in size back to the enlarged intermediate section of the coupling. It has been found, that a tapered ridge has a decided advantage in gripping the conduit, and it has been found convenient to employ a combination of the longitudinal and transverse ridges in the jawsof the coupling. f

The central passage 19 kof the coupling is preferably tapered from the mouth of the coupling to the enlarged intermediate section, 'and the continuation of that passage provided by the neck of the coupling is also preferably tapered from the enlarged irr- Vtermediate section toward the nipple or rounded portion 10, so that it will be seen that the smaller area in the passage provided bythe coupling asa whole is at the base of the nipple or rounded portion 10,

j and that the jaws of the coupling will bind the conduit with greater tension at about the center of the coupling than at the mouth of the coupling. Vith this construction the liability for abrasion due to the handling of the wires within the outlet box is reduced to a minimum. s

Ithas been found that in couplings herotofore constructed the spiral thread or groove of the interior of the jaws has been adapted to grip only one form of spirally armored conduit, whereas the "present construct-ion is adapted to grip and securely hold any form or construction of conduit, the size depending upon the size of coupling employed.

Further attention is called to the nipples 10 and 11 provided at the inner and outer ends of the neck of the coupling, a feature which insures positively againstany wearing upon the insulation, the offset `9 also insuring against any rough edges which might be in a position to injure the insulation of the wires. In. finishingthese couplings, the inside edge'QO of the mouth of the coupling is also finished srnooth, and the whole pref l erably japanned so that there are no rough surfaces upon the entire coupling.

Various `modifications may be made Without departing from the spirit of the invention. v v

s Having described ythe invention, what I claim as new and desire to secure by Letters Patent, is:

1. A combination coupling and bushing comprising a two part sleeve and a nipple, one 'part of said sleeve being connected to said nipple. onev part of said sleeve being provided internally with lon itudinal ridges, and the other part ofv said sieve being pro# vided internally' with transverse ridges.

2. A Combination coupling and bushing comprising a two-part sleeve* and a nipple, one part of saidsleeve being connected t0 said nipple, one part of said sleeve being provided With internal ridges at an angle to In testimony whereof I aHiX my signature.

in presence of two Witnesses.

WILLIAM ALEXANDER BONNEIIL.

Witnesses:

P. H. J. DALY, THOMAS A. HILL. 

